Lyrics.java

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Lyrics {
    public static void adjustTime(In filename, int adj) {
        String regex
                = "([0-9]{2}):([0-9]{2}):([0-9]{2}).([0-9]{3}).*([0-9]{2}):([0-9]{2}):([0-9]{2}).([0-9]{3})";
        Pattern pattern = Pattern.compile(regex);
        while (filename.hasNextLine()) {
            String line = filename.readLine();
            Matcher matcher = pattern.matcher(line);
            if (matcher.find()) {
                int h1 = Integer.parseInt(matcher.group(1));
                int m1 = Integer.parseInt(matcher.group(2));
                int s1 = Integer.parseInt(matcher.group(3));
                int ms1 = Integer.parseInt(matcher.group(4));
                int h2 = Integer.parseInt(matcher.group(5));
                int m2 = Integer.parseInt(matcher.group(6));
                int s2 = Integer.parseInt(matcher.group(7));
                int ms2 = Integer.parseInt(matcher.group(8));
                int x = ms1 + adj;
                int Ms1 = x % 1000;
                x = s1 + x / 1000;
                int S1 = x % 60;
                x = m1 + x / 60;
                int M1 = x % 60;
                int H1 = h1 + x / 60;
                int xx = ms2 + adj;
                int Ms2 = xx % 1000;
                xx = s2 + xx / 1000;
                int S2 = xx % 60;
                xx = m2 + xx / 60;
                int M2 = xx % 60;
                int H2 = h2 + xx / 60;
                System.out.println(H1 + ":" + M1 + ":" + S1 + "," + Ms1 + " --> "
                                           + H2 + ":" + M2 + ":" + S2 + "," + Ms2);
            }
            else System.out.println(line);
        }
    }

    public static void main(String[] args) {
        In in = new In(args[0]);
        int adj = Integer.parseInt(args[1]);
        adjustTime(in, adj);
    }
}